title: [Usefulness for evaluation of the left ventricular disorders by apexcardiographic A-wave ratio in patients with hypertrophic cardiomyopathy].
abstract: Usefulness for evaluation of left ventricular disorders by apexcardiographic A-wave ratio was studied in 48 patients with hypertrophic cardiomyopathy. These subjects were divided into 3 groups: A-wave ratio less than or equal to 15% (group 1), 16% less than or equal to A-wave ratio less than or equal to 29% (group 2), and A-wave ratio greater than or equal to 30% (group 3). A-wave ratio was found to have a positive correlation with Time constant T (r = + 0.71), left ventricular end-diastolic pressure (r = +0.46), and left ventricular atrial kick (r = +0.55). During exercise, ejection fraction decreased significantly (p less than 0.05) in group 3 as compared to group 1. During treadmill exercise test, rise of systolic blood pressure was significantly (p less than 0.05) poor, and there was a large number of ST depression (p less than 0.05) in group 3. It was recognized by exercise thallium-201 myocardial scintigraphy, that the frequency of perfusion defect was 30% in group 3. In conclusion, high A-wave ratio may strongly suggest impaired left ventricular diastolic function, and, there was correlated to abnormal hemodynamic state during exercise. Apexcardiographic A-wave ratio proved to be useful in patients with hypertrophic cardiomyopathy. It is useful for evaluation of left ventricular disorders.
authors.affiliation: Department of Medicine, Kawasaki Medical School.
authors.forename: T
authors.initials: T
authors.lastname: Yada
authors.forename: S
authors.initials: S
authors.lastname: Nezuo
authors.forename: T
authors.initials: T
authors.lastname: Sawayama
authors.forename: K
authors.initials: K
authors.lastname: Hasegawa
authors.forename: S
authors.initials: S
authors.lastname: Tadaoka
authors.forename: S
authors.initials: S
authors.lastname: Inoue
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Kawahara
authors.forename: A
authors.initials: A
authors.lastname: Kimura
authors.forename: K
authors.initials: K
authors.lastname: Tamura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D006328:Cardiac Catheterization; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis* / Q000503:physiopathology; D005080:Exercise Test; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D007702:Kinetocardiography; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D016277:Ventricular Function, Left